Threshold Effects in Two--Photon Decays of Higgs Particles

Details Threshold Effects in Two--Photon Decays of Higgs Particles Threshold Effects in Two--Photon Decays of Higgs Particles

1994-05-16

arxiv.org/abs/hep-ph/9405301v1

Z.Phys. C64 (1994) 401-406

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, latex, figures not included, style files zer.sty and z12.sty appended, DESY 94-076, BUDKERINP-94-39

Scientific paper

10.1007/BF01560100

The couplings of Higgs particles to two photons are analyzed in the threshold region, where the Higgs mass is about twice the loop--particle mass leading to possible bound state formation. The amplitude of the pseudoscalar decay $A\to \gamma\gamma$ for pseudoscalar masses in the range of $(t\bar t)$--bound state masses is calculated in leading and next--to--leading order in $\alpha_s$. It is shown that the real and imaginary parts of the form factor are significantly different from the lowest order perturbative one.

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